Stylus suspension
AssigneeSonic Research Inc.
InventorPeter E. Pritchard
Life of this patent
Estimating the term…
Abstract
A stylus suspension for a phonograph pick-up cartridge. A first improvement includes an asymmetrically mounted ring and washer clamping the suspension block in a manner that dampens vertical compliance of the suspension. A further improvement includes a suspension block specifically adapted to accommodate the ring, thus more particularly defining the pivot point. In this instance the ring may be mounted symmetrically or as in the first improvement. A still further improvement includes an armature of reduced mass that, surprisingly, does not result in lessened performance.
Claims12
A stylus suspension for a phonograph pick-up cartridge comprising:
- a plastic housing having an aperture;
- a resilient suspension block retained against the inside wall of said aperture, and having a central, axial opening;
- a stylus assembly comprising a stylus cantilever tube having a stylus at its distal end and attached to an armature tube at its opposed end, said armature tube being secured within said axial opening in said suspension block;
- and
- a separate clamping ring frictionally retained against the inside wall of said aperture and compressing said suspension block within said aperture, said plastic housing being sufficiently compliant to accept said ring.
A stylus assembly for a phonograph pick-up cartridge comprising:
- a non-magnetic cantilever tube and a magnetic armature tube, said tubes joined at their inner ends;
- a stylus at the outer end of said cantilever tube;
- suspension means on said armature tube;
- the outer end portion of said armature tube having a reduced wall thickness, thereby reducing the mass of said armature.
A stylus suspension for a phonograph pick-up cartridge comprising:
- a plastic housing having an aperture;
- a resilient suspension block retained against the inside wall of said aperture, and having a central, axial opening;
- a stylus assembly comprising a stylus cantilever tube having a stylus at its distal end and attached to an armature tube at its opposed end, said armature tube being secured within said axial opening in said suspension block;
- a separate clamping ring frictionally retained against the inside wall of said aperture and compressing said suspension block within an aperture, said plastic housing being sufficiently compliant to accept said ring;
- said clamping ring asymmetrically clamping said suspension block in a manner adapted to dampen vertical motion of said stylus;
- and
- said armature having a reduced cross-sectional thickness at the end portion thereof opposed to said cantilever tube.
A stylus suspension for a phonograph pick-up cartridge comprising:
- a plastic housing having a round aperture therethrough and an inwardly-extending annular shoulder at one end;
- a first washer seated in said aperture against the inside wall of said aperture and seated against said first washer, and having a central, axial square opening and an annular shoulder on the side opposed to said first washer;
- a stylus assembly comprising a stylus cantilever tube having a stylus at its distal end and attached to an armature tube at its opposed end, said armature tube including a portion of square outside cross-section secured in said square opening;
- a second washer in said aperture seated against said shoulder in said suspension block and having an inner diameter sized to pre-tension said suspension block;
- a separate clamping ring frictionally retained against the inside wall of said aperture and seated against said second washer, said ring compressing said suspension block, and said plastic housing being sufficiently compliant to accept said ring.
Dependencies are inferred from the claim text.